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Basis for original (SCP) IDLH: Propane is a simple asphyxiant and does not present an IDLH hazard at concentrations below its lower explosive limit (LEL). The chosen IDLH is based on the LEL of 21,000 ppm rounded down to 20,000 ppm.

Short-term exposure guidelines: None developed

ACUTE TOXICITY DATA

Animal data: None relevant for use in determining the revised IDLH.

Human data: It has been reported that brief inhalation exposures to 10,000 ppm propane cause no symptoms in humans [Braker and Mossman 1980]. Propane is considered to be a simple asphyxiant [ACGIH 1991].

Revised IDLH: 2,100 ppm [LEL]

Basis for revised IDLH: Based on acute inhalation toxicity data in humans [ACGIH 1991; Braker 1980], a value much greater than 10,000 ppm would have been appropriate. However, the revised IDLH for propane is 2,100 ppm based strictly on safety considerations (i.e., being 10% of the lower explosive limit of 2.1%).